Audio amplifier having a digital display window



FIG. 1 is a top plan view of an audio amplifier having a digital display window which forms my invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view thereof. 

The ornamental design for an audio amplifier having a digital display window, as shown and described. 